On July 31, 1996, Microsoft unveiled Windows NT 4.0 to its manufacturing partners. This release, codenamed Cairo, integrated the Windows 95 interface into a 32-bit enterprise OS and was the last version to support Alpha, MIPS, or PowerPC CPU architectures. The first public release of the NT line was Windows NT Server 3.1 in 1993, followed by versions 3.5 and 3.51 in 1994 and 1995, respectively. Windows NT 4.0 introduced features like My Computer and My Documents, as well as advanced components such as the cryptography API, DCOM, TAPI 2.0, and DirectX (v2). It had low minimum system requirements, recommending a CPU of 33 MHz or better, 32MB of RAM, SVGA graphics, and a 256 MB hard disk. NT 4.0 served as the foundation for Windows XP, which was released in 2001.